Technical Field
[0001] The present invention relates to a sensor metadata generation device, a sensor metadata
generation system, a sensor metadata generation method, and a sensor metadata generation
program.
Background Art
[0002] In recent years, a technology called IoT (Internet of Things) has been developed.
IoT is a technology that creates new value by combining information relating to various
things that exist in the world on a communications network. In order to generate value
from IoT, it is necessary to read the state of things with sensors and distribute
sensing data.
[0003] Patent Literature 1 relates to a mechanism for distributing sensing data, and in
Patent Literature 1, there is disclosed a data flow control order generating apparatus
that matches sensor-side metadata, which is information relating to a sensor that
outputs sensing data, and application-side metadata, which is information relating
to an application that provides a service using the sensing data, and transmits a
data flow control order specifying the sensor and the application that have been matched.
Citation List
Patent Literature
Summary of Invention
Technical Problem
[0005] As described in Patent Literature 1, matching of sensors and applications can be
smoothly performed using metadata such as sensor-side metadata. Here, the metadata
may be individually generated by the user.
[0006] However, sensing data is expected to increase in the future, and if users individually
generate metadata, it is expected that not only will the amount of work become quite
large, but metadata of different formats will be generated for a plurality of sensors
that output equivalent sensing data, and therefore the processing load and the communications
load when matching sensors and applications will increase.
[0007] Therefore, an object of the present invention is to provide a sensor metadata generation
device, a sensor metadata generation system, a sensor metadata generation method,
and a sensor metadata generation program capable of generating metadata of the same
format for sensors that output equivalent sensing data.
Solution to Problem
[0008] A sensor metadata generation device according to one aspect of the present invention
includes: a class storage unit configured to store a sensor container class that includes,
as components, one or a plurality of sensor classes each including definitions of
attributes of one or a plurality of sensors, and a sensor composition class including
a composition condition for compositing the one or a plurality of sensors as a single
sensor entity, with a first interface that includes a declaration of a metadata acquisition
method for acquiring metadata being mounted in the sensor container class; an object
generation unit configured, based on the sensor container class, to generate a sensor
container object in which the configuration of the single sensor entity is defined;
and a metadata acquisition unit configured to use the metadata acquisition method
by the sensor container object to acquire metadata of the single sensor entity.
[0009] According to this aspect, the first interface is mounted in the sensor container
class, so existence of the metadata acquisition method is secured, and it is possible
to unify metadata acquisition rules. Therefore, it is possible to generate metadata
of the same format for a group of sensors that output equivalent sensing data. Also,
uniform metadata is generated, so it is possible to suppress the processing load and
the communications load when matching sensor groups and applications.
[0010] In the above aspect, a configuration may be adopted in which the class storage unit
stores the sensor class in which the first interface is mounted, the object generation
unit, based on the sensor class, generates a sensor object in which the configuration
of a sensor is defined, and the metadata acquisition unit uses the metadata acquisition
method by the sensor object to acquire metadata of the sensor.
[0011] According to this aspect, the first interface is mounted in the sensor class, so
existence of the metadata acquisition method is secured, and it is possible to unify
metadata acquisition rules. Therefore, it is possible to generate metadata of the
same format for sensors that output equivalent sensing data. Also, uniform metadata
is generated, so it is possible to suppress the processing load and the communications
load when matching sensors and applications.
[0012] In the above aspect, a configuration may be adopted in which, in the sensor container
class, a second interface that includes a declaration of a sensing data acquisition
method for acquiring sensing data to be output from the single sensor entity is mounted,
and the sensor metadata generation device further includes a sensing data acquisition
unit configured to use the sensing data acquisition method by the sensor container
object to acquire the sensing data.
[0013] According to this aspect, the second interface is mounted in the sensor container
class, so existence of the sensing data acquisition method is secured, and it is possible
to unify sensing data acquisition rules. Therefore, it is possible to accumulate sensing
data by uniform processing, and it is possible to suppress the processing load and
the communications load that accompany a seach for sensing data.
[0014] In the above aspect, a configuration may be adopted in which the sensor metadata
generation device further includes: a receiving unit configured to receive selection
of one or a plurality of sensors and a composition condition for compositing the one
or a plurality of sensors as a single sensor entity; and a class generation unit configured
to generate a sensor container class that includes, as components, one or a plurality
of sensor classes each including definitions of attributes of one or a plurality of
sensors for which selection was received by the receiving unit, and a sensor composition
class including a composition condition received by the receiving unit, with a first
interface being mounted in the sensor container class; and the class storage unit
stores the sensor container class generated by the class generation unit.
[0015] According to this aspect, one or a plurality of sensors are combined as a single
sensor entity, and by generating a new sensor container class, it is possible to prescribe
the basic configuration of the single sensor entity. Therefore, the basic configuration
of sensors does not change for each sensing data provider, and metadata can be acquired
with fixed rules by the metadata acquisition method. As a result, it is possible to
suppress the processing load and the communications load when generating metadata.
[0016] A sensor metadata generation system according to one aspect of the present invention
includes: the sensor metadata generation device according to the above aspect; and
one or a plurality of sensors configured to be connected to the sensor metadata generation
device through a communications network; in which the sensor metadata generation device
generates metadata of the one or a plurality of sensors.
[0017] According to this aspect, with the sensor metadata generation device that is capable
of generating metadata of the same format for sensors that output equivalent sensing
data, it is possible to generate metadata of the same format for a single sensor entity.
Also, uniform metadata is generated, so it is possible to suppress the processing
load and the communications load when matching a single sensor entity and an application.
[0018] A metadata generation method according to one aspect of the present invention includes:
a step of, based on a sensor container class that includes, as components, one or
a plurality of sensor classes each including definitions of attributes of one or a
plurality of sensors, and a sensor composition class including a composition condition
for compositing the one or a plurality of sensors as a single sensor entity, with
a first interface that includes a declaration of a metadata acquisition method for
acquiring metadata being mounted in the sensor container class, generating a sensor
container object in which the configuration of the single sensor entity is defined;
and
a step of using the metadata acquistion method by the sensor container object to acquire
metadata of the single sensor entity.
[0019] According to this aspect, the first interface is mounted in the sensor container
class, so existence of the metadata acquisition method is secured, and it is possible
to unify metadata acquisition rules. Therefore, it is possible to generate metadata
of the same format for a single sensor entity that outputs equivalent sensing data.
Also, uniform metadata is generated, so it is possible to suppress the processing
load and the communications load when matching a single sensor entity and an application.
[0020] A metadata generation program according to one aspect of the present invention causes
a computer to function as: a class storage unit configured to store a sensor container
class that includes, as components, one or a plurality of sensor classes each including
definitions of attributes of one or a plurality of sensors, and a sensor composition
class including a composition condition for compositing the one or a plurality of
sensors as a single sensor entity, with a first interface that includes a declaration
of a metadata acquisition method for acquiring metadata being mounted in the sensor
container class; an object generation unit configured, based on the sensor container
class, to generate a sensor container object in which the configuration of the single
sensor entity is defined; and a metadata acquisition unit configured to use the metadata
acquisition method by the sensor container object to acquire metadata of the single
sensor entity.
[0021] According to this aspect, the first interface is mounted in the sensor container
class, so existence of the metadata acquisition method is secured, and it is possible
to unify metadata acquisition rules. Therefore, it is possible to generate metadata
of the same format for a single sensor entity that outputs equivalent sensing data.
Also, uniform metadata is generated, so it is possible to suppress the processing
load and the communications load when matching a single sensor entity and an application.
Advantageous Effects of Invention
[0022] According to the present invention, there are provided a sensor metadata generation
device, a sensor metadata generation system, a sensor metadata generation method,
and a sensor metadata generation program capable of generating metadata of the same
format for sensors that output equivalent sensing data.
Brief Description of Drawings
[0023]
FIG. 1 shows a network configuration of a sensor metadata generation system according
to an embodiment of the present invention;
FIG. 2 shows a physical configuration of a metadata generation device according to
an embodiment of the present invention;
FIG. 3 shows a functional block diagram of the metadata generation device according
to an embodiment of the present invention;
FIG. 4 is a flowchart showing first processing executed by the metadata generation
device according to an embodiment of the present invention;
FIG. 5 is a flowchart showing second processing executed by the metadata generation
device according to an embodiment of the present invention;
FIG. 6 is a flowchart showing processing relating to sensor container class generation
executed by the metadata generation device according to an embodiment of the present
invention; and
FIG. 7 shows an example of a sensor construction screen displayed by the metadata
generation device according to an embodiment of the present invention.
Description of Embodiments
[0024] Embodiments of the present invention will be described with reference to the accompanying
drawings. Note that, in each drawing, the same reference signs are assigned to items
that have the same or a similar configuration.
[0025] FIG. 1 shows a network configuration of a sensor metadata generation system 1 according
to an embodiment of the present invention. The sensor metadata generation system 1
according to the present embodiment includes a metadata generation device 10 that
generates sensor metadata, one or a plurality of sensors 20, and a sensing data storage
unit DB. Note that the sensor metadata generation system 1 may include configurations
other than these. The metadata generation device 10 is connected to a communications
network N, and is connected to one or a plurality of the sensors 20 and the sensing
data storage unit DB through the communications network N. The communications network
N may be either a wired communications network or a wireless communications network
configured by a wired or wireless line, and may be the Internet or a LAN (Local Area
Network). Note that in the present specification, a sensor metadata generation device
is referred to simply as a metadata generation device.
[0026] The sensor 20 may be either a physical quantity sensor that detects a physical quantity
or an information sensor that detects information. The physical quantity sensor may
include, for example, a camera that detects light and outputs image data or movie
data, or a microphone that detects sound and outputs audio data, or may include a
sensor that detects another arbitrary physical quantity and outputs an electrical
signal. The information sensor may include, for example, a sensor that detects a specific
pattern from statistical data, or may include a sensor that detects other arbitrary
information.
[0027] The sensing data storage unit DB stores sensing data output by the sensor 20. In
FIG. 1, the sensing data storage unit DB is shown as a single storage unit, but the
sensing data storage unit DB may be configured using one or a plurality of file servers.
[0028] FIG. 2 shows the physical configuration of the metadata generation device 10 according
to an embodiment of the present invention. The metadata generation device 10 includes
a CPU (Central Processing Unit) 10a corresponding to a hardware processor, a RAM (Random
Access Memory) 10b corresponding to a memory, a ROM (Read Only Memory) 10c corresponding
to a memory, a communications interface 10d, an input unit 10e, and a display unit
10f. These configurations are connected to each other so as to be able to transmit
and receive data through a bus.
[0029] The CPU 10a executes a program stored in the RAM 10b or the ROM 10c, and calculates
and processes data. The CPU 10a is a computing device that executes an application
for generating metadata. The CPU 10a receives various input data from the input unit
10e and the communications interface 10d, and displays calculation results of the
input data on the display unit 10f, or stores these calculation results in the RAM
10b or the ROM 10c.
[0030] The RAM 10b is a storage unit capable of rewriting data, and is configured with,
for example, a semiconductor storage element. The RAM 10b stores programs and data
of applications or the like executed by the CPU 10a.
[0031] The ROM 10c is a storage unit that can only read data, and is configured with, for
example, a semiconductor storage element. The ROM 10c, stores, for example, programs
and data of firmware or the like.
[0032] The communications interface 10d is a hardware interface that connects the metadata
generation device 10 to the communications network N.
[0033] The input unit 10e receives input of data from a user, and is configured with, for
example, a keyboard, a mouse, or a touch panel.
[0034] The display unit 10f visually displays the results of calculation by the CPU 10a,
and is configured using, for example, an LCD (Liquid Crystal Display).
[0035] The metadata generation device 10 may be configured by executing a metadata generation
program according to the present embodiment with the CPU 10a of a common personal
computer. The metadata generation program may be provided stored in a computer-readable
storage medium such as the RAM 10b or the ROM 10c, or may be provided through the
communications network N connected through the communications interface 10d.
[0036] Note that these physical configurations are given as examples, and are not necessarily
independent configurations. For example, the metadata generation device 10 may include
an LSI (Large-Scale Integration) in which the CPU 10a, the RAM 10b, and the ROM 10c
are integrated.
[0037] FIG. 3 shows a functional block diagram of the metadata generation device 10 according
to an embodiment of the present invention. The metadata generation device 10 includes
a communications unit 11, a control unit 12, a receiving unit 13, a class generation
unit 14, a class storage unit 15, an object generation unit 16, a metadata acquisition
unit 17, and a sensing data acquisition unit 18. Note that the functional blocks shown
in FIG. 3 represent functions to be exhibited using the physical configurations provided
in the metadata generation device 10, and do not necessarily correspond one-to-one
with physical configurations.
[0038] The communications unit 11 is connected to an external communications network N,
and transmits and receives data. The control unit 12 controls processing executed
by the metadata generation device 10.
[0039] The receiving unit 13 receives selection of one or a plurality of sensors and a composition
condition for compositing the one or a plurality of sensors as a single sensor entity.
The receiving unit 13 receives selection of one or a plurality of sensors from a user,
or receives a composition condition, in a sensor construction screen described later
with reference to the drawings. Here, the single sensor entity includes one or a plurality
of sensors whose selection has been received by the receiving unit 13, and functions
as a group of sensors according to a composition condition.
[0040] The class generation unit 14 generates a sensor container class that includes, as
components, one or a plurality of sensor classes each including definitions of attributes
of one or a plurality of sensors for which selection was received by the receiving
unit 13, and a sensor composition class including a composition condition received
by the receiving unit 13, with a first interface that includes a declaration of a
metadata acquisition method for acquiring metadata being mounted in the sensor container
class. Here, a sensor attribute is data that characterizes a sensor, and for example,
may include a type of the information or physical quantity detected by the sensor,
a data format of sensing data output by the sensor, a regulation or standard relating
to the sensor, a data output format such as REST type or STREAM type, a sensor communications
speed, data describing the sensor, or data facilitating a search for the sensor. Also,
the sensor class, the composition class, and the sensor container class may be defined
using an object-oriented programming language, and respectively prescribe types of
sensor objects, composition objects, and sensor container objects. Also, the first
interface is an interface mounted in a class, and defines a function shared by a plurality
of classes. Note that the first interface defines how to call a metadata acquisition
method for acquiring metadata, and does not define the content of the metadata acquisition
method. The class generation unit 14 can also generate a sensor class that includes
a definition of the attributes of one sensor for which selection was received by the
receiving unit 13, with a first interface being mounted in the generated sensor class.
[0041] The composition class may include an operation class for performing operations such
as addition or subtraction on sensing data to be output from one or a plurality of
sensors, and may include a trigger class that prescribes a condition in which a plurality
of sensors output sensing data as a single sensor entity. Also, the sensor container
class may include a timer class that measures time.
[0042] The class storage unit 15 stores the sensor container class generated by the class
generation unit 14. That is, the class storage unit 15 stores a sensor container class
that includes, as components, one or a plurality of sensor classes each including
definitions of attributes of one or a plurality of sensors, and a sensor composition
class including a composition condition for compositing the one or a plurality of
sensors as a single sensor entity, with a first interface that includes a declaration
of a metadata acquisition method for acquiring metadata being mounted in the sensor
container class. Also, the class storage unit 15 stores a sensor class in which the
first interface is mounted. In the sensor container class, a second interface that
includes a declaration of a sensing data acquisition method for acquiring sensing
data to be output from the single sensor entity is mounted, and in a sensor class,
a second interface that includes a declaration of a sensing data acquisition method
for acquiring sensing data to be output from a sensor is mounted.
[0043] The object generation unit 16 generates a sensor container object in which the configuration
of a single sensor entity is defined based on the sensor container class. Here, the
sensor container object is an object of a type prescribed by the sensor container
class, and may include specific information relating to attributes of one or a plurality
of sensors, specific information relating to a composition condition for compositing
one or a plurality of sensors as a single sensor entity, specific information relating
to a metadata acquisition method for acquiring metadata, and specific information
relating to a sensing data acquisition method for acquiring sensing data. Also, the
object generation unit 16 generates a sensor object in which the configuration of
the sensor is defined based on the sensor class. A sensor object is an object of a
type prescribed by a sensor class, and may include specific information relating to
attributes of a sensor, specific information relating to a metadata acquisition method
for acquiring metadata, and specific information relating to a sensing data acquisition
method for acquiring sensing data.
[0044] The metadata acquisition unit 17 uses the metadata acquisition method by a sensor
container object to acquire metadata of a single sensor entity. The sensor container
object is an object of a type prescribed by the sensor container class, and the sensor
container class includes a metadata acquisition method, because the first interface
is mounted when the sensor container class is generated by the class generation unit
14. Also, by mounting the first interface, it is possible to provide uniform metadata
acquisition rules for all of the sensor container objects. Also, the metadata acquisition
unit 17 uses the metadata acquisition method by a sensor object to acquire sensor
metadata. Also regarding the sensor class that prescribes the type of sensor object,
the first interface is mounted when the sensor class is generated by the class generation
unit 14, so it is possible to provide uniform metadata acquisition rules for all of
the sensor objects.
[0045] The sensing data acquisition unit 18 uses the sensing data acquisition method by
a sensor container object to acquire sensing data. The sensor container class and
the sensor class include a sensing data acquisition method, because a second interface
that includes a declaration of a sensing data acquisition method for acquiring sensing
data to be output from a single sensor entity is mounted. By mounting the second interface,
it is possible to provide uniform sensing data acquisition rules for all of the sensor
container objects and all of the sensor objects.
[0046] FIG. 4 is a flowchart showing first processing executed by the metadata generation
device 10 according to an embodiment of the present invention. The metadata generation
device 10 generates a sensor container object with the object generation unit 16 based
on a sensor container class stored in the class storage unit 15 (S10). The metadata
acquisition unit 17, using the metadata acquisition method by the sensor container
object (S11), acquires metadata relating to one or a plurality of sensors prescribed
by the sensor container object and metadata relating to a composition condition for
compositing one or a plurality of sensors as a single sensor entity (S12).
[0047] According to the metadata generation device 10 according to the present embodiment,
the first interface is mounted in the sensor container class, so existence of the
metadata acquisition method is secured, and it is possible to unify metadata acquisition
rules. Therefore, it is possible to generate metadata of the same format for a single
sensor entity that outputs equivalent sensing data. Also, uniform metadata is generated,
so it is possible to suppress the processing load and the communications load when
matching a single sensor entity and an application.
[0048] Also, according to the sensor metadata generation system 1 according to the present
embodiment, it is possible to generate metadata of the same format for a single sensor
entity with the metadata generation device 10, which is capable of generating metadata
of the same format for a single sensor entity that outputs equivalent sensing data.
Also, uniform metadata is generated, so it is possible to suppress the processing
load and the communications load when matching a single sensor entity and an application.
[0049] The sensing data acquisition unit 18 of the metadata generation device 10, using
the sensing data acquisition method by the sensor container object (S13), acquires
sensing data to be output from the single sensor entity prescribed by the sensor container
object (S14).
[0050] According to the metadata generation device 10 according to the present embodiment,
the second interface is mounted in the sensor container class, so existence of the
sensing data acquisition method is secured, and it is possible to unify sensing data
acquisition rules. Therefore, it is possible to accumulate sensing data by uniform
processing, and it is possible to suppress the processing load and the communications
load that accompany a seach for sensing data.
[0051] FIG. 5 is a flowchart showing second processing executed by the metadata generation
device 10 according to an embodiment of the present invention. The metadata generation
device 10 generates a sensor object with the object generation unit 16 based on a
sensor class stored in the class storage unit 15 (S20). The metadata acquisition unit
17, using the metadata acquisition method by the sensor object (S21), acquires metadata
relating to a sensor prescribed by the sensor object (S22).
[0052] The first interface is mounted in the sensor class, so existence of the metadata
acquisition method is secured, and it is possible to unify metadata acquisition rules.
Therefore, it is possible to generate metadata of the same format for sensors that
output equivalent sensing data. Also, uniform metadata is generated, so it is possible
to suppress the processing load and the communications load when matching sensors
and applications.
[0053] The sensing data acquisition unit 18 of the metadata generation device 10, using
the sensing data acquisition method by the sensor object (S23), acquires sensing data
to be output from a sensor prescribed by the sensor object (S24).
[0054] According to the metadata generation device 10 according to the present embodiment,
the second interface is mounted in the sensor class, so existence of the sensing data
acquisition method is secured, and it is possible to unify sensing data acquisition
rules. Therefore, it is possible to accumulate sensing data by uniform processing,
and it is possible to suppress the processing load and the communications load that
accompany a seach for sensing data.
[0055] FIG. 6 is a flowchart showing processing relating to sensor container class generation
executed by the metadata generation device 10 according to an embodiment of the present
invention. The receiving unit 13 receives selection of one or a plurality of sensors
(S30). Also, the receiving unit 13 receives a composition condition for compositing
the one or a plurality of sensors for which selection was received as a single sensor
entity (S31).
[0056] The class generation unit 14 generates a sensor container class that includes, as
components, one or a plurality of sensor classes each including definitions of attributes
of one or a plurality of sensors for which selection was received by the receiving
unit 13, and a sensor composition class including a composition condition received
by the receiving unit 13, with a first interface being mounted in the sensor container
class (S32). The generated sensor container class is stored in the class storage unit
15 (S33).
[0057] According to the metadata generation device 10 according to the present embodiment,
one or a plurality of sensors are combined as a single sensor entity, and by generating
a new sensor container class, it is possible to prescribe the basic configuration
of the single sensor entity. Therefore, the basic configuration of sensors does not
change for each sensing data provider, and metadata can be acquired with fixed rules
by the metadata acquisition method. As a result, it is possible to suppress the processing
load and the communications load when generating metadata.
[0058] FIG. 7 shows an example of a sensor construction screen DP displayed by the metadata
generation device 10 according to an embodiment of the present invention. The sensor
construction screen DP is a screen displayed by a sensor construction tool for receiving
selection of one or a plurality of sensors and composition conditions for compositing
the one or a plurality of sensors as a single sensor entity, constructing the single
sensor entity, and publishing the constructed single sensor entity. Using various
tools displayed in the sensor construction screen DP, a sensing data provider can
construct a single sensor entity without performing programming, and can publish the
constructed single sensor entity.
[0059] The sensor construction screen DP of this example includes a sensor arrangement screen
DP1 and a composition condition setting screen DP2. Also, the sensor construction
screen DP includes a pointer PT of a pointing device. Note that the sensor construction
screen DP may include configurations other than these. A user who uses the sensor
construction tool operates a sensor icon displayed in the sensor arrangement screen
DP1 with the pointer PT to select a sensor or change the arrangement or direction
of a sensor. Also, the user uses the composition condition setting screen DP2 to set
the composition conditions of the sensors arranged in the sensor arrangement screen
DP1.
[0060] FIG. 7 shows an example of the sensor construction screen DP in a case of constructing
a single sensor entity that detects a traffic accident. The sensor arrangement screen
DP1 shows a case where a first sensor group 100 is arranged at a first intersection
A1 on a north side and a second sensor group 200 is arranged at a second intersection
A2 on a south side. In the case of this example, the first sensor group 100 includes
a first camera 101, a second camera 102, and a first microphone 103. The first camera
101 is arranged on the east side of the first intersection A1, and photographs the
first intersection A1 from the east side toward the west. The second camera 102 is
arranged on the west side of the first intersection A1, and photographs the first
intersection A1 from the west side toward the east. The first microphone 103 is arranged
to the southeast of the first intersection A1 and records sound generated at the first
intersection A1.
[0061] In the case of this example, the second sensor group 200 includes a third camera
201 and a second microphone 202. The third camera 201 is arranged on the south side
of the second intersection A2, and photographs the second intersection A2 from the
south side toward the north. The second microphone 202 is arranged to the southwest
of the second intersection A2, and records sound generated at the second intersection
A2.
[0062] The sensor arrangement screen DP1 may include display of descriptive information
300. The descriptive information 300 is information that describes the single sensor
entity, and may be a title of a single sensor entity. In the case of this example,
the descriptive information 300 is an "accident detection sensor". A user who uses
the sensor construction tool can edit the descriptive information 300 to include arbitrary
information for describing the single sensor entity.
[0063] A user who uses the sensor construction tool can designate the correspondence of
the cameras and microphones arranged in the sensor arrangement screen DP1 to the cameras
and microphones actually arranged in the first intersection A1 and the second intersection
A2. The sensor construction tool can acquire specific attributes of the arranged sensors
based on the designation by the user.
[0064] In the case of this example, the composition condition setting screen DP2 includes
a first composition condition C1 and a second composition condition C2. Composition
conditions for compositing a plurality of sensors included in a sensor group that
has been selected from the first sensor group 100 and the second sensor group 200
as a single sensor entity are displayed in the composition condition setting screen
DP2. In this example, a case where composition conditions of the first sensor group
100 are displayed in the composition condition setting screen DP2 is described.
[0065] The first composition condition C1 prescribes a condition relating to "trigger",
that is, a condition such that sensing data is output with the first sensor group
100 used as a single sensor entity. In this example, the first composition condition
C1 is "at least X dB", and prescribes that sensing data is output using the single
sensor entity when a sound of at least X dB has been detected by the first microphone
103.
[0066] The second composition condition is a condition relating to "recording range". The
second composition condition prescribes a time range of movie data and audio data
to output in a case where the first sensor group 100 satisfies the first composition
condition C1 relating to "trigger". In this example, the second composition condition
C2 is "one minute before to five minutes after", and prescribes that, in a case where
a sound of at least X dB has been detected by the first microphone 103, with respect
to a time range of one minute before to five minutes after the sound of at least X
dB was detected by the first microphone 103, movie data that has been recorded by
the first camera 101 and the second camera 102, and audio data that has been recorded
by the first microphone 103, are output as sensing data using a single sensor entity.
[0067] The class generation unit 14 generates a sensor container class that includes, as
components, one or a plurality of sensor classes each including definitions of attributes
of one or a plurality of sensors for which arrangement as one group of sensors was
received in the sensor arrangement screen DP1, and a sensor composition class including
a composition condition for which setting was received in the composition condition
setting screen DP2, with a first interface that includes a declaration of a metadata
acquisition method for acquiring metadata being mounted in the sensor container class.
Also, the object generation unit 16, based on the sensor container class, generates
a sensor container object that includes, as components, one or a plurality of sensor
objects each including definitions of specific attributes of one or a plurality of
sensors, and a sensor composition object including a specific composition condition
for which setting was received by the composition condition setting screen DP2, with
a first interface mounted in the sensor container object.
[0068] The metadata acquisition unit 17, for example, may extract attributes of a sensor
included in a sensor container object as metadata. That is, the metadata, for example,
may include a type of information or physical quantity detected by a sensor, a data
format of sensing data output by the sensor, a regulation or standard relating to
the sensor, a data output format such as REST type or STREAM type, a sensor communications
speed, data describing the sensor, or data facilitating a search for the sensor. Also,
the metadata may include 4W2H information. 4W2H information is information indicating
data regarding sensing of "Who", "What", "When", "Where", or "How", and "How Much"
(indicating a price at which the data is provided). The item "Who" may be data relating
to a data provider or a data providing organization. The item "What" may be data relating
to a data type, an object to be measured or an attribute to be measured. The item
"Where" may be data relating to the position or location where a measurement was performed.
However, when the sensor that acquires the data moves and the measurement position
changes, this data may indicate a range of the measurement position. The item "When"
may be data relating to the time when a measurement was performed. When data acquisition
is performed periodically and repeatedly, this item may indicate the data acquisition
period and the acquisition interval, and when data acquisition is performed singly,
this item may indicate the date and time of the data acquisition. The item "How" may
be data relating to specifications, measurement conditions, and installation conditions
of a device that acquires data. The item "How much" (indicating a price at which the
data is provided) may be data relating to an amount of money required for data use
and a payment method. Note that, although the 4W2H information is information representing
the characteristics of sensing data, sensor metadata may also include such information.
That is, the sensor metadata may include information representing the characteristics
of the sensing data output by the sensor.
[0069] In the case of the example shown in FIG. 7, the metadata acquisition unit 17 may
extract the items included in the metadata with reference to the arrangement state
of the sensors in the sensor arrangement screen DP1 and the composition conditions
that have been set in the composition condition setting screen DP2. For example, the
metadata acquisition unit 17 may refer to the descriptive information 300 and extract
"accident detection" as the item "What". Also, the metadata acquisition unit 17 may
refer to the occurrence time when occurrence of the accident was detected and extract
the item "When", or may refer to the installation location of each sensor and extract
the item "Where". Also, the metadata acquisition unit 17 may refer to the first composition
condition C1 and extract "at least X dB" as the item "How".
[0070] The embodiments described above are intended to facilitate understanding of the present
invention, and are not to be interpreted as limiting the present invention. The elements
included in the embodiment and the arrangement, material, conditions, shape, size,
and the like of the elements are not limited to those described in examples, and can
be changed as appropriate. Also, configurations disclosed in different embodiments
can be partially substituted or combined with each other.
[0071] Also, some portion or all of the above embodiments can also be described as stated
in the following supplementary notes, but those portions are not limited by the following
description.
(Supplementary Note 1)
[0072] A sensor metadata generation device, including:
at least one memory, and at least one hardware processor connected to the memory,
in which the memory stores a sensor container class that includes, as components,
one or a plurality of sensor classes each including definitions of attributes of one
or a plurality of sensors, and a sensor composition class including a composition
condition for compositing the one or a plurality of sensors as a single sensor entity,
with a first interface that includes a declaration of a metadata acquisition method
for acquiring metadata being mounted in the sensor container class, and
the hardware processor, based on the sensor container class, generates a sensor container
object in which the configuration of the single sensor entity is defined, and
uses the metadata acquisition method by the sensor container object to acquire metadata
of the single sensor entity.
(Supplementary Note 2)
[0073] A sensor metadata generation method, including:
with at least one hardware processor, based on a sensor container class that includes,
as components, one or a plurality of sensor classes each including definitions of
attributes of one or a plurality of sensors, and a sensor composition class including
a composition condition for compositing the one or a plurality of sensors as a single
sensor entity, with a first interface that includes a declaration of a metadata acquisition
method for acquiring metadata being mounted in the sensor container class, generating
a sensor container object in which the configuration of the single sensor entity is
defined, and
with the hardware processor, using the metadata acquisition method by the sensor container
object to acquire metadata of the single sensor entity.
List of Reference Numerals
[0074]
- 1
- Sensor metadata generation system
- 10
- Metadata generation device
- 10a
- CPU
- 10b
- RAM
- 10c
- ROM
- 10d
- Communications interface
- 10e
- Input unit
- 10f
- Display unit
- 11
- Communications unit
- 12
- Control unit
- 13
- Receiving unit
- 14
- Class generation unit
- 15
- Class storage unit
- 16
- Object generation unit
- 17
- Metadata acquisition unit
- 18
- Sensing data acquisition unit
- 20
- Sensor
- 100
- First sensor group
- 101
- First camera
- 102
- Second camera
- 103
- First microphone
- 200
- Second sensor group
- 201
- Third camera
- 202
- Second microphone
- 300
- Descriptive information
- A1
- First intersection
- A2
- Second intersection
- B1
- First icon
- B2
- Second icon
- C1
- First composition condition
- C2
- Second composition condition
- DB
- Sensing data storage unit
- DP
- Sensor construction screen
- DP1
- Sensor arrangement screen
- DP2
- Composition condition setting screen
- N
- Communications network
- PT
- Pointer